In retrospect, if one looks at my net pay, it's roughly 3.5% that I set aside for savings. I don't count the small amounts that I put into the 401k at work, our pension plan deductions, or the disability insurance deductions.
The disability insurance has no resale value and takes up 6% of my net pay. The retirement is near 7% of my *gross* pay or roughly 10% of net pay.
The 30% seems awfully harsh, but it's easier for some people to live simply. :-)